Crown MRX-24/24S Matrixers Owner's manual

Brand: Crown

Model: MRX-24/24S Matrixers

Type: Owner's manual

Crown MRX-24/24S Matrixers are computerized relay patch bay systems, available in both master and slave versions. They allow for flexible routing of balanced audio signals, from microphone level to 70V speaker level, as well as AC/DC power, digital signals, and other electrical signals. Each relay can handle at least 1 ampere at 100V continuously, or 0.5 A at 100V while switching.

The MRX-24/24S Matrixers can function in a variety of matrix formats, with individual relay groups configurable as 6x1, 1x6, or as a group bus with six switched lines and one unswitched common line. Four of these groups are present on a single MRX-24/24S module.

@crown

* System

Quick Reference

MRX-24

™

/24S MATRIXERS

Overview

The

MRX-24

™

is a computerized relay patch

bay system. It also is available in a slave ver-

sion (

MRX-24S

). Operating under IQ control,

both versions have 24 DPST (balanced) re-

lays, arranged in four groups of six (four 6x1),

for switching electrical signals. The

MRX-24/

24S

is ideal for routing balanced audio from

microphone level to 70V speaker level, AC

or DC power, digital signal routing and switch-

ing, and other electrical signals. Each relay

can handle at least 1 ampere at 100V (0.5 A

while switching). Pictured to the right are the

front panels of an

MRX-24

and an

MRX-24S

Simple descriptions follow that introduce

each feature of the unit, and provide brief

overview of operation and basic electrical

specifications.

Masters and Slaves

In terms of practical operation, the slave ver-

sion is almost identical to the master version.

A slave utilizes the microprocessor of its

master to operate its own relays. Up to 31

slaves may be operated from any one mas-

ter, including

MRX-12

™

master units (

MRX-

is another Matrixer model with a different

relay configuration). Without its own proces-

sor, slave unit Aux ports are inoperative and

it has no battery backup. Slaves communi-

cate with their master via special slave bus,

and the addressing of masters and slaves is

handled differently. By using the pro-

cessing power of a master unit, using

slaves in larger Matrixer systems is

highly cost effective.

IQ-CAG Card Cage Installation

All IQ Matrixer units are designed for

easy installation into a Card Cage. The

IQ-CAG is a four rack space cage

which can hold about 6 MRX modules

plus an IQ-LPS +12 VDC Linear Power

Supply. Matrixers require +12 VDC. If

an IQ-LPS is not used, another supply

such as an adaptor or battery is re-

quired. Components designed to

mount in the IQ-CAG are modular in

construction. They slide into the cage

on rails, and are held in place by small

screws. At the rear of the cage “T-

board” is used to provide connection

to relays, and for digital communica-

tion. The T-board for

MRX-24/24S

units

is shown on the following page.

Front Panels

Front panels for both versions are

shown to the right. On each is a power

indicator showing that the unit is powered by

+12 VDC. A DSPI indicator also lights up to

indicate that digital information addressed to

that unit is being received. When power is

removed an internal battery will maintain pro-

MRX-24/24S MODULE CIRCUIT BOARD

gramming memory in a master unit for at least

60 days.

A. Relays

MRX-24/24S

relays are DPST devices which

POWER

1718 W. Mishawaka Rd.



Elkhart, IN 46517 U.S.A.

DSPI

MRX

–

POWER

1718 W. Mishawaka Rd.



Elkhart, IN 46517 U.S.A.

DSPI

MRX

–

MRX-24 (MASTER) & MRX-24S (SLAVE)



B A F E C D

MRX-24/24S “T-Board” For

External Connections

MRX-24

T-BOARD

460015

+12 V

GND

BOARD

ADDRESS

AUX OUT

AUX IN

16

8

4

2

AUX GND

+12 V

GND

IQ BUS

+IN

–IN

+OUT

–OUT

GND

SB8

SB7

SB6

SB5

SB4

SB3

SB2

SB1

SLAVE

BUS

CONNECTIONS

SB GROUND

SB +12

PULLUP

REL 1A

REL 1B

REL 2A

REL 2B

REL 3A

REL 3B

REL 4A

REL 4B

REL 5A

REL 5B

REL 6A

REL 6B



REL 1A

REL 1B

REL 2A

REL 2B

REL 3A

REL 3B

REL 4A

REL 4B

REL 5A

REL 5B

REL 6A

REL 6B



GP3 COM A

GP3 COM B

GP4 COM A

GP4 COM B

GROUP 3GROUP 4

REL 1A

REL 1B

REL 2A

REL 2B

REL 3A

REL 3B

REL 4A

REL 4B

REL 5A

REL 5B

REL 6A

REL 6B



REL 1A

REL 1B

REL 2A

REL 2B

REL 3A

REL 3B

REL 4A

REL 4B

REL 5A

REL 5B

REL 6A

REL 6B



GP1 COM A

GP1 COM B

GP2 COM A

GP2 COM B

XB4

XB3

XB2

XB1

GROUP 2 GROUP 1

can handle one ampere at 100V continuously, or 0.5 A at 100V while switch-

ing. Relays are arranged as four groups of six. One side of each of the six

in a group are tied together to an unswitched common external connec-

tor. Refer to the block diagram shown on the next page. By tying relays

together at the T-board, any form of matrix can be formed with the neces-

sary number of MRX modules.

B. Edge Connector

When installing the MRX module into the cage, the edge connector seats

into a female edge connector mounted to the T-board.

C. MRX Microprocessor

Only master MRX units have an installed microprocessor. Slave units op-

erate by special communication, called a Slave Bus, with a master unit.

D. IQ Component Address

Both master and slave units have this DIP switch on their circuit boards,

but the address is only used with master units. On slave units this set of

switches is out of circuit and unused. Up to 250 master units can be used

on any one Crown Bus serial data loop to the system interface.

E. Battery Backup

Master units have a battery installed to maintain processor memory when

the +12 VDC supply is lost. This battery will maintain memory for at least

60 days.

F. Battery Backup Enable Jumper

A jumper is provided to disable battery backup if that feature is not de-

sired.

G. Relay Connectors

Connections to relay contacts are made via mini-barrier strip pins.

H. Power Supply Connection

Plated holes are provided for connection of +12 VDC and ground from

an IQ-LPS or other 12 volt supply. Holes are sized to accept #6 screws.

I. Sensing Aux Port

A mini-barrier block connector is provided for auxiliary functions. +10

VDC at 20 mA is output at Aux Out when switched on. Aux In senses

voltage: if +3 to +20 VDC is sensed (with respect to Aux Ground), the

microprocessor will interpret the voltage as a digital high (on condi-

tion). Note that although both the master and slave versions have this

connection, only the master’s Aux port is operational.

J. Crown Bus

A 5-pin mini-barrier block connector is provided for digital communi-

cation via the Crown Bus serial data loop to other IQ components. This

connector is only used by master units (present on both).

K. Board (Slave) Address

Master units communicate with other IQ system components via Crown

Bus, and thus use the IQ Address setting (item D). Slave units use the

Board Address to identify themselves to the master unit. The five position

switch allows for 31 valid settings (a setting of 0 is not valid), thus up to 31

slaves can be operated from one master. Board Address settings have

no effect on master units.

L. Slave Bus (SB1-8)

An 8-pin mini-barrier block connector is provided for digital communica-

tion via the Slave Bus between a master unit and its slaves. This is a

parallel communications bus and must tie into all slaves being operated

by one master. For complete communication the XB4 and SB Ground

connections must also be made, as detailed under items M and N.

M. Extended Bus (XB1-4)

A 4-pin mini-barrier block connector is provided for Extended

Bus communication. With present firmware, only the XB4 pin is

actually used. The XB4 pin must be con-

nected in the same manner as SB pins (mas-

ter to each of its slaves). The XB4 line serves

as an acknowledgment line for the parallel

data bus.

N. SB Ground

A 4-pin mini-barrier block connector is pro-

vided as a digital ground for slave bus refer-

ence. SB Ground must be tied together from

a master to each of its slaves for proper digi-

tal ground reference on the Slave Bus.

Digital Communication

The form of communication available be-

tween master MRX units and other IQ Sys-

tem components is the Crown Bus. The

Crown Bus is a communication standard for

serial transmission of IQ command protocol.

It normally operates on a simple two-wire 20

mA current loop (fiber optic optional). See

also item J. When operating on a Crown Bus

loop, a system interface is required for com-

munication with a computer. A Drone can also

be used to manipulate MRX modules. A spe-

cial slave bus is used between a master unit

and up to 31 slaves. This is a ten wire system

including SB1-8, XB4, and SB Ground. The

slave bus is a parallel communication me-

dium allowing the processor on a master unit

to take direct control of slave unit functions.

Applications

MRX-24/24S

IQ Matrixers can serve a vari-

ety of very powerful functions. You custom-

ize operation, tailoring it to the system require-

ments.

MRX-24/24S

units can function in a

variety of matrix formats. Individual relay

groups can function as 6x1, 1x6, or can sim-

ply be viewed as a group bus which any of

seven lines—six switched and one

unswitched common—can tie into. Four of

these groups are present on a single

MRX-

24/24S

module.

It can switch low power loads such as light-

ing, fan, and motor controls, low DC and AC

power, and all types of audio and digital elec-

trical signals. The

MRX-24/24S

can even

switch relatively low power

speaker lines, including 70V dis-

tribution and routing.

Besides easy routing of bal-

anced audio, the MRX-24 makes

it easy to perform current moni-

toring operations, either with in-

dividual speakers or in groups.

This is done by adding small re-

sistances to the speaker lines,

then using the

MRX-24/24S

control which speaker

line(s) will be monitored.

An IQ

SMX-6

™

sensing

mixer/multiplexer moni-

tors whichever speaker

line is routed to it by the

matrixer.

For applications where

higher voltages or cur-

rents are being

switched, the

MRX-12

MRX-12S

is recom-

mended.

Additional Electrical

Specifications

Protection: The MRX

units use dry contact

relays with no other in-

line electronics. For pro-

tection, power

circuits con-

trolled by

POWER

SUPPLY

BATTERY

BACKUP

(MEMORY)

AUX PORT &

CROWN BUS

POWER

DSPI

12345678

IQ ADDRESS

MICRO-

PROCESSOR

DECODER

+12 V

GND

RELAY

DRIVERS

SLAVE BUS

12345

BOARD

ADDRESS

GROUP 1 GROUP 2

GROUP 3 GROUP 4

X-BUS

these units must be properly fused.

Controls: An 8 segment DIP switch on the com-

ponent face of the circuit board is used to

set the Master unit’s IQ address. A 5 seg-

ment DIP switch on the

MRX-24T

T-board sets

the slave unit board address. A jumper on

the face of the module disconnects battery

backup on master units.

Display: Power LED shows presence of +12

VDC supply, DSPI LED shows reception of

digital information addressed to the unit.

Power Requirements: +12 VDC.

Aux Port: Three pins of an 8 pin mini-barrier

strip provide Aux Ground reference, Aux Out

supplies +10 VDC at 20 mA, and Aux In is a

sensing input where +3 to +20 VDC = Digital

High. Aux In floats, and therefor must be tied

to ground to force the input off.

Crown Bus: Five pins of an 8 pin mini-barrier

strip allow connection to a two-wire 20 mA

current loop for Crown Bus communication.

The Crown Bus is a serial data communica-

tion standard used between a system inter-

face and its loop components.

Slave Bus: The slave bus is a parallel commu-

nications medium used between a master

MRX unit and up to 31 slaves. Required con-

nections include SB1-8, XB4, and SB Ground.

All connectors are on mini-barrier strips lo-

cated on the T-board.

Dimensions: 2.5 inches (6.35 cm) wide for 2-

space IQ-CAG mounting; 7 inches (17.78 cm)

high, and 12.125 inches (30.8 cm) behind

mounting surface.

Finish: Smooth black powder coat.

Relays:

Contacts: 48 (24 pair).

Contact Form: DPST.

Maximum Switching Voltage: 100

VAC Peak.

Maximum Switching Current: 0.5

amperes.

Maximum Carry Current: 1 ampere.

Operation Time: 1 msec.

Release Time: 1 msec.

Mechanical Life Expectancy: 10 mil-

lion operations.

Guaranteed Excellence

@crown

Crown International, Inc.

PO Box 1000

Elkhart, IN 46515-1000

Ph. 800-342-6939/219-294-8200

Fax. 219-294-8301

Trademark Notice:

MRX-12,

™

MRX-24,

™

and

SMX-6

™

are trademarks,

and

Crown

and

IQ System

are registered trade-

marks of Crown International Inc.

MRX-24/24S Block Diagram

Crown MRX-24/24S Matrixers Owner's manual

Crown MRX-24/24S Matrixers Owner's manual

Crown MRX-24/24S Matrixers Owner's manual

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